- #1
ajenkin9
- 5
- 0
I'm working on a basic physics lab report (not homework) and I'm trying to understand something better. We're establishing a relation between voltage and current using Ohms law. It goes as follows:
We apply different voltages to two materials and record the current in order to determine the resistance. The two materials are a resistor and a light bulb. My problem has occurred when graphing though.
I know that the relationship for an ohmic material is linear, therefore it's simply (1/R). This would be true for the resistor. The lightbulb however is a nonohmic material, therefore it's not a linear relationship.
The way my graph looks is not the same as in the book though. The book shows a graph which looks like an exponential function (x^2), approaches a verticle asymptote. My graph for the lightbulb though looks opposite (looks more like a sqrt function) and approaches a horizontal asymptote. When looking online I saw a V versus I graph for a filament and it looked the same as mine.
My question is, why is this? Why do I have a different graph than what the book shows for a nonohmic material, but I see other "filament" graphs look the same as mine.
Thanks.
We apply different voltages to two materials and record the current in order to determine the resistance. The two materials are a resistor and a light bulb. My problem has occurred when graphing though.
I know that the relationship for an ohmic material is linear, therefore it's simply (1/R). This would be true for the resistor. The lightbulb however is a nonohmic material, therefore it's not a linear relationship.
The way my graph looks is not the same as in the book though. The book shows a graph which looks like an exponential function (x^2), approaches a verticle asymptote. My graph for the lightbulb though looks opposite (looks more like a sqrt function) and approaches a horizontal asymptote. When looking online I saw a V versus I graph for a filament and it looked the same as mine.
My question is, why is this? Why do I have a different graph than what the book shows for a nonohmic material, but I see other "filament" graphs look the same as mine.
Thanks.